6000 V6-173 2.8L VIN W FI (1986)
Clutch: All Technical Service Bulletins
A/T - 1-2 Shift Shudder
Number
87-7-20A
Date
9/88
Subject:
1-2 SHIFT SHUDDER - REPLACING THE 2ND CLUTCH PLATES
1985-87 6000 AND 1987 BONNEVILLE MODELS EQUIPPED WITH THM 440-T4 (ME9)
This bulletin supersedes 87-7-20, dated 6/87, which should now be destroyed. The bulletin is being revised to add 1985-86 model years and to clarify
when the service parts listed should be ordered."
BULLETIN COVERS:
A 1-2 shift shudder on 1984-1987 vehicles equipped with a THM 440-T4 transaxle may be caused by out of flat 2nd clutch fiber plates. This condition
may be repaired by replacing the 2nd clutch plates with the Service Packages described in the Service Parts Information section below.
FIGURE 1 - THM 440-T4 TRANSAXLE IDENTIFICATION INFORMATION
DATE OF PRODUCTION CHANGE: (Figure 1)
April 15, 1987 (Julian Date 105), all 1987 THM 440-T4 transaxles were built using the new 2nd clutch fiber plates. The new plates were also used in all
Service Replacement Transmission Assembly (SRTA) models starting on April 15, 1987 (Julian Date 105).
SERVICE ACTION:
When servicing a THM 440-T4 transaxle for a 1-2 shift shudder condition or performing a complete overhaul, DO NOT use the 2nd clutch fiber plates
from an overhaul package that has a D7 or earlier packaging Julian Date stamped on the carton. Refer to the Service Parts Information section below for
an additional package to order. Overhaul packages with an E7 and later packaging date contain the new fiber plates and an additional package is not
required.
SERVICE PARTS INFORMATION:
IMPORTANT:
Only order the service package listed below if the overhaul package has a D7 or earlier packaging date. All overhaul packages that
have an E7 or later packaging date have the new 2nd clutch fiber plates and there is no need to order the service package listed below.
Service
Package
Contents
Application
8662913
2nd Clutch Plate Package
1985-1986 model years
-
(5) steel plates
-
(5) fiber plates
8662914
2nd Clutch Plate Package
1987 model year
-
(6) steel plates
-
(6) fiber plates
Parts are currently available from GMSPO.